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.Dd December 23, 1999
.Dt VOP_GETACL 9
.Os
.Sh NAME
.Nm VOP_GETACL
.Nd retrieve access control list for a vnode
.Sh SYNOPSIS
.In sys/param.h
.In sys/vnode.h
.In sys/acl.h
.Ft int
.Fn VOP_GETACL "struct vnode *vp" "acl_type_t type" "struct acl *aclp" "struct ucred *cred" "struct thread *td"
.Sh DESCRIPTION
This vnode call may be used to retrieve the access control list (ACL) from a
file or directory.
.Pp
Its arguments are:
.Bl -tag -width type
.It Fa vp
The vnode of the file or directory.
.It Fa type
The type of ACL to retrieve.
.It Fa aclp
A pointer to an ACL structure to receive the ACL data.
.It Fa cred
The user credentials to use in authorizing the request.
.It Fa td
The thread requesting the ACL.
.El
.Pp
The
.Fa cred
pointer may be
.Dv NULL
to indicate that access control checks are not to be performed, if possible.
This cred setting might be used to allow the kernel to authorize ACL
retrieval that the active process might not be permitted to do.
.Pp
The vnode ACL interface defines the syntax, and not semantics, of file and
directory ACL interfaces.
More information about ACL management in kernel may be found in
.Xr acl 9 .
.Sh LOCKS
The vnode will be locked on entry and should remain locked on return.
.Sh RETURN VALUES
If the
.Fa aclp
pointer will point to a valid ACL, then zero is returned.
Otherwise, an appropriate error code is returned.
.Sh ERRORS
.Bl -tag -width Er
.It Bq Er EINVAL
The ACL type passed is invalid for this vnode.
.It Bq Er EACCES
The caller does not have the appropriate privilege.
.It Bq Er ENOMEM
Sufficient memory is not available to fulfill the request.
.It Bq Er EOPNOTSUPP
The file system does not support
.Fn VOP_GETACL .
.El
.Sh SEE ALSO
.Xr acl 9 ,
.Xr vnode 9 ,
.Xr VOP_ACLCHECK 9 ,
.Xr VOP_SETACL 9
.Sh AUTHORS
This manual page was written by
.An Robert Watson .
